I have just inherated the at&t e5634b phone system. I have replaced the batteries in the hand sets. As per the manual I have de-registered each hand set.
The problem is that when I register the hand set using the ID number on the bottom of the base. The phone accepts it with no problem. the screen on the handset goes blank and about 5 minutes later the hand set request the base ID again.
This happens no mater which hand set I use, and I have tried each hand set and number of times.
I have the manual, and have reset the base charger. Please help...what is the problem????

This problem can be caused by the following, A bad battery, (which you say you are all new). A full base memory and a Faulty main base unit
This main base unit can only expand to four handsets and no more. If the base unit has been reset then the assigned numbers for each handset would begin with " handset 1" if they show any other number when reset then it would not have been reset..To re-set main base you will have to
De-Register All Handsets
Unplug the power supply from the base unit then Remove all handsets from the charge cradles and base then Press and hold the PAGE button on the base.
Plug in the power supply again while pressing the PAGE button, Continue pressing PAGE until the IN USE and CHARGING indicators are lit. (this could take up to 10 seconds)
Release the PAGE button All Handsets will display "enter base id".
If this does not solve your problem then you will have to replace the main base

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Related Questions:

This sounds like a registration problem, each 'old'
handset must be de-registered from its original
base and then registered to the 'new' base.

NOTE: the CS6229 handles a maximum of 5
handsets. If you have a handset displaying
"Handset #5" then you have a 'fully populated system'
even if you actually have only one or two handsets.

You will need to clear each handset ( I ) then clear
the base of all registrations ( II ) before re-registering
each handset ( III ) up to the maximum of five.
=====================================
( I ). First, to de-register a handset ---

1. press [Find Handset] on the base and hold
past ~4 sec when the "In Use" lamp lights, at
about 10 secs the "In Use" lamp will begin to
blink.
2. release the [Find Handset] button momentarily,
then briefly press it again. After a moment,
all handsets that were registered to the base
(if any) will display "Not Registered" and be
ready for fresh registration
===============================

( III.) To register each handset to the base:

1. press [Find Handset] on the base and hold for
~4 sec until the "In Use" lamp lights.
2. press # on the handset and set the handset into
the handset cradle on the base
3. within 30 seconds or so, the handset will either
chirp and display "Handset Registered", then
"Handset #x" or it will say "Registration Failed".

NOTE: the battery must be well charged prior to the
registration process, a weak battery may cause a
"Registration Failed". Charge the battery for a
few hours and try the registration ( III ) again.

Registering a handset
If you see a "not registered" message on a handset,
you must register it to a base before using it.
1.
On the base, open the menu and select
Register Accy.
2.
On the handset, press and hold #/DND
until the handset display says
Handset Registering (about 2 seconds).
3.
Wait until the handset display says
Registration Complete (about 30 seconds),
then pick up the handset.
If you don't hear a dial tone or the display says
Registration Failed, charge the battery completely,
then try again.

1. press [Find Handset] on the base and hold for
~4 sec until the "In Use" lamp lights.
2. press # on the handset and set the handset into
the handset cradle on the base
3. within 30 seconds or so, the handset will either
chirp and display "Handset Registered", then
"Handset #x" or it will say "Registration Failed".

NOTE: the battery must be well charged prior to the
registration process, a weak battery may cause a
"Registration Failed". Charge the battery for a
few hours and try the registration ( III ) again.

NOTE 2: Some cs6114 bases do not have the "In Use"
lamp indicator. To register the handset simply park it
displaying "Not Registered" in the base cradle and wait
for the registration to occur. Pressing # as above may
be required, maybe not.
===============================
Good luck !!

The errant handsets must be de-registered from their
original base and then registered to your base.

NOTE: the CS6649 handles a maximum of only five
handsets. If you have a handset displaying
"Handset #5" then you have a 'fully populated system'
even if you actually have only one or two handsets.
In that case, you can clear each handset ( I ) then clear
the base of all registrations ( II ) before re-registering
each handset ( III ) up to the maximum of five.
=====================================
( I ). First, to de-register a handset ---

1. press [Find Handset] on the base and hold
past ~4 sec when the "In Use" lamp lights, at
about 10 secs the "In Use" lamp will begin to
blink.
2. release the [Find Handset] button momentarily,
then briefly press it again. After a moment,
all handsets that were registered to the base
(if any) will display "Not Registered" and be
ready for fresh registration
===============================

( III.) To register each handset to the base:

1. press [Find Handset] on the base and hold for
~4 sec until the "In Use" lamp lights.
2. press # on the handset and set the handset into
the handset cradle on the base
3. within 30 seconds or so, the handset will either
chirp and display "Handset Registered", then
"Handset #x" or it will say "Registration Failed".

NOTE: the battery must be well charged prior to the
registration process, a weak battery may cause a
"Registration Failed". Charge the battery for a
few hours and try the registration ( III ) again.

yes de-register most of the phones from the base station and then
re gister them in the correct order to get the desired numbers. You have the instruction manual from my earlier post so just de register most of the phones being 2 to 4 and re resister them in the desired order .

*331734#Menu Select on the handset should de-register that handset from the old base, then you can register it to the base as per the manual (put it in the base and hold down the handset locator button for 4 seconds)

SOLUTION to AT&T Cordless Telephone/Answering System 4 phone set Model E5634B - Cannot answer incoming calls nor does caller ID work on phones.
Unplug the base for a few minutes, plug base back in, remove and reinsert the battery on each phone that does not work, then place each handset in the base for few minutes. Worked for me...all 4 phones can be answered and caller ID works!!! Hope this works for you... :o)